CN114466501A

CN114466501A - Relaxation method

Info

Publication number: CN114466501A
Application number: CN202210143857.3A
Authority: CN
Inventors: 樊启文; 王�华; 孟波
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-10

Abstract

The application belongs to the technical field of accelerator application and discloses a relaxation method. The method is to relax the release film by providing a negative pressure to the release film to extend the release film vertically down to a desired depth. The release film is fixed on the target frame, and the surface of the release film is kept wet before relaxation. The relaxation method has the advantages that the peeling film extends downwards to 1-3 mm in the vertical direction, the success rate of relaxation reaches over 90%, and the service life of the relaxed peeling film is prolonged by 3 times compared with that before relaxation.

Description

Relaxation method

Technical Field

The application belongs to the technical field of accelerator application, and particularly relates to a relaxation method.

Background

The use of a release film on the tandem accelerator can increase the energy of the extracted particle beam. The carbon or DLC release films currently used in tandem accelerators have a short life, requiring frequent replacement of the release film during beam delivery. In nuclear physics experiments, a high-current strong low-energy heavy ion beam needs to be led out from a tandem accelerator sometimes, which puts higher requirements on the service life of a stripping film. Frequent replacement of the release film directly results in a shortened repair cycle of the accelerator, a reduced accelerator operating efficiency, and an increased accelerator operating cost.

Therefore, a technical scheme capable of remarkably prolonging the service life of the stripping film of the accelerator is urgently needed.

Disclosure of Invention

Technical purpose

In accordance with the problems of the prior art, the present application provides a method of extending a release film downward in a vertical direction to relax the release film, by which the life of the release film can be significantly improved.

(II) technical scheme

In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:

a relaxation method is a method of relaxing a release film by supplying a negative pressure to the release film to extend the release film downward in a vertical direction to a desired depth.

Preferably, the release film is fixed on the target frame, and the surface of the release film before relaxation has a certain humidity.

Preferably, the downward relaxation depth of the release film is 1-3 mm.

Preferably, the release film is baked while being relaxed during the relaxation process, so that the relaxation speed and efficiency are improved.

Preferably, the relaxation method is implemented by using a relaxation apparatus, wherein the relaxation apparatus comprises:

a relaxation chamber for supporting the release film; a first through hole penetrating in the vertical direction is formed in the relaxation chamber, and the space where the first through hole is located is an air storage chamber; a stripping film to be relaxed is placed at the upper end of the first through hole;

the air supply chamber is used for providing compressed air and providing a negative pressure environment for the air storage chamber and is positioned below the relaxation chamber; the air supply chamber comprises an air supply pipe, a reducer pipe, an air outlet pipe and a compressed air source, and compressed air flows in the directions of the compressed air source, the air supply pipe, the reducer pipe and the air outlet pipe; the diameter-variable pipe is a diameter-variable pipeline with the diameter from large to small according to the flowing direction of compressed air, and a second pore channel corresponding to the through hole of the air storage chamber is arranged on the pipe wall on the upper side of the diameter-variable pipe; when compressed air flows through the first through hole, a negative pressure environment is provided for the air storage chamber, and the to-be-loosened stripping film extends downwards in the vertical direction.

Preferably, one end of the air supply pipe is connected with a compressed air source, the other end of the air supply pipe is connected with the end with the larger diameter of the reducer pipe, and compressed air enters the reducer pipe from the air supply pipe; one end of the air outlet pipe is positioned at the compressed air outflow side of the second pore passage in the reducing pipe, the other end of the air outlet pipe is positioned outside the reducing pipe, and the axle centers of the air outlet pipe and the reducing pipe are positioned on the same horizontal position.

Preferably, the end of the air outlet pipe, which is positioned in the reducing pipe, is connected with the thread arranged on the inner wall of the reducing pipe through the outer wall of the air outlet pipe, and the distance between the air outlet pipe and the air supply pipe can be adjusted through the thread.

Preferably, the pressure of the compressed air in the air supply pipe is 1.2-1.8 times of the standard atmospheric pressure.

Preferably, the flow rate of the compressed air in the air supply pipe is 0.5-2L/min.

Preferably, the number of the gas supply chambers is 1 or more; the relaxation device further comprises a main air supply unit which supplies compressed air to all the air supply chambers.

Preferably, a soft gasket is arranged at the upper end of the diameter of the first through hole, and the soft gasket is used for supporting the to-be-loosened stripping film.

Preferably, the main gas supply part and the gas supply chamber gas supply pipeline are provided with valves for adjusting flow rate.

Preferably, the relaxation device further comprises a bearing table; the relaxation chamber and the air supply chamber are positioned above the bearing table; the main air supply part is positioned below the bearing table and provides compressed air for the air supply chamber through a pipeline.

Preferably, a base with adjustable height is arranged below the bearing table.

Preferably, the relaxation chamber is cylindrical, rectangular parallelepiped or other structure.

Preferably, the relaxation device further comprises a drying device

Preferably, the drying device comprises a lamp holder and a tungsten lamp positioned on the lamp holder.

Preferably, the release film is a carbon release film or a DLC release film.

Preferably, the film to be relaxed is fixed on a target frame and placed at the upper end of the first through hole, wherein the size of the first through hole is smaller than that of the target frame and larger than that of the film to be relaxed.

(III) advantageous effects

By adopting the relaxation method provided by the application, the compressed air flows in the air supply chamber, so that the peeling film in the relaxation chamber extends downwards to 1-3 mm in the vertical direction, the success rate of relaxation reaches above 90%, and the service life of the peeled film after relaxation is improved by 3 times compared with that before relaxation.

Drawings

FIG. 1 is a schematic view of the overall structure of the relaxation device of the present invention

FIG. 2 is a schematic view of the main structure of the relaxation device provided by the present invention;

FIG. 3 is a schematic cross-sectional view of the main structure of the relaxation device provided by the present invention;

wherein 1 is a relaxation chamber; 1-1 is a first via; 1-2 is an air storage chamber; 1-3 are soft gaskets; 2 is an air supply chamber; 2-1 is a gas supply pipe; 2-2 is a reducer pipe; 2-3 is an air outlet pipe; 3 is a bearing platform; 4 is an adjusting seat; 5 is a lamp bracket; and 6 is a valve.

Detailed Description

The present application will be further described with reference to specific embodiments and drawings attached to the specification.

Examples

Due to the requirement of nuclear physics experiments, more and more heavy ion beams with large current intensity and low energy are led out from the accelerator, and higher requirements are put forward on the service life of the stripping film, for example, the service life of a common stripping film is 4-8 min when the common stripping film is stripped by 197 Au-ions of 9-11 MeV and 1 muA, the beam time of one experiment of a physical user is usually 100h, and therefore the stripping film needs to be changed continuously. The quantity of stripping films which can be installed at one time in the accelerator is limited, the short service life of the stripping films directly causes unsmooth beam supply in a physical experiment, the repair period of the accelerator is shortened, the running efficiency of the accelerator is further reduced, and the running cost of the accelerator is increased. The present embodiment provides a relaxation apparatus and a relaxation method that can significantly improve the life of a release film.

A relaxation method for a peeling film which is fixed on a target frame by applying a negative pressure to the peeling film and vertically extending the peeling film down to a desired depth (generally 1 to 3mm) to relax the peeling film, wherein the surface of the peeling film before the relaxation has a certain humidity, and the fresh peeling film which is just rinsed is preferred. The stripping film is baked while being loosened in the loosening process, so that the loosening speed and efficiency are improved.

The relaxation method uses a relaxation apparatus comprising: a relaxation chamber of a cylindrical, rectangular parallelepiped shape or other structure for supporting the carbon stripping film; a first through hole 1-1 penetrating in the vertical direction is arranged in the relaxation chamber, and the space where the first through hole 1-1 is located is an air storage chamber 1-2; after the carbon stripping film to be relaxed is fixed on the target frame, the carbon stripping film is placed at the upper end of the first through hole 1-1, and the diameter of the through hole at the upper end of the gas storage chamber is not less than that of the carbon stripping film to be relaxed; the target frame is an annular target frame.

The relaxation device also comprises an air supply chamber 2 for supplying compressed air and a negative pressure environment for the air storage chamber 1-2, which is positioned below the relaxation chamber 1; the air supply chamber 2 comprises an air supply pipe 2-1, a reducer pipe 2-2, an air outlet pipe 2-3 and a compressed air source, and compressed air flows in the directions of the air supply pipe 2-1, the reducer pipe 2-2 and the air outlet pipe 2-3; the diameter-variable pipe 2-2 is a diameter-variable pipeline with the diameter from large to small according to the flowing direction of compressed air, and a second pore channel corresponding to the through hole of the air storage chamber is arranged on the pipe wall on the upper side of the diameter-variable pipe; when compressed air flows through the first through hole 1-1, a negative pressure environment is provided for the air storage chamber, and the carbon stripping film to be loosened extends downwards in the vertical direction.

One end of the air supply pipe 2-1 is hermetically connected with a compressed air source, the other end of the air supply pipe is hermetically connected with the larger diameter end of the reducer pipe 2-2, and compressed air enters the reducer pipe 2-2 from the air supply pipe 2-1; one end of the air outlet pipe 2-3 is positioned at the compressed air outflow side of the second pore passage in the reducer pipe 2-2 and is connected with the inner wall of the reducer pipe 2-2 through threads arranged on the outer wall of the air outlet pipe 2-3, and the distance between the air outlet pipe and the air supply pipe can be adjusted through the threads. The other end of the air outlet pipe 2-3 is positioned outside the reducer pipe 2-2, and the axle center of the air outlet pipe 2-3 and the smaller end of the reducer pipe 2-2 are positioned on the same horizontal position.

The pressure of the compressed air in the air supply pipe 2-3 is 1.2 times of the standard atmospheric pressure. The flow rate of compressed air in the air supply pipe 2-3 is 0.5L/min.

The number of the air supply chambers 2 is 16; the relaxation device further comprises a main air supply unit which supplies compressed air to all the air supply chambers.

And a soft gasket 1-3 is arranged at the upper end of the first through hole 1-1 and used for supporting the to-be-loosened stripping film.

And valves 6 for adjusting flow rate are arranged on the main gas supply part and the gas supply pipeline of the gas supply chamber.

Another embodiment of the present invention provides a relaxation device further comprising a carrier 3; the relaxation chamber 1 and the air supply chamber 2 are positioned above the plummer 3, and the number of the air supply chambers is 8; the main air supply unit is located below the susceptor 3 and supplies compressed air to the air supply chamber 2 through a pipeline. An adjusting seat 4 with adjustable height is arranged below the bearing table 3. The relaxed release film was a DLC release film fixed to the backing plate. The pressure of the compressed air in the air supply pipe 2-3 is 1.5 times the standard atmospheric pressure. The flow rate of compressed air in the air supply pipe 2-3 is 1L/min.

The invention also provides an embodiment, and the relaxation device further comprises a drying device, wherein the drying device comprises a lamp holder and a tungsten lamp positioned on the lamp holder. The pressure of the compressed air in the air supply pipe 2-3 is 1.8 times of the standard atmospheric pressure. The flow rate of compressed air in the air supply pipe 2-3 is 2L/min. The release film to be relaxed is a DLC film.

With the relaxing method, the release film is extended downward in the vertical direction to a desired depth by supplying a negative pressure to the release film for the flow of compressed air in the air supply chamber to relax the release film. The stripping film is fixed on the target frame, and the surface of the stripping film before loosening has certain humidity. The downward relaxation depth of the stripping film is 1-3 mm. The stripping film is baked while being loosened in the loosening process, so that the loosening speed and efficiency are improved.

The life of the release film used for the accelerator can be increased by 3 times after relaxation by this relaxation method.

Claims

1. A relaxation method characterized by comprising a step of providing a negative pressure to a release film to vertically extend the release film down to a desired depth to relax the release film.

2. The relaxing method according to claim 1, wherein the release film is fixed to the frame, and the surface of the release film is kept wet before the relaxing.

3. The relaxation method as claimed in claim 1, wherein the release film is relaxed downward to a depth of 1 to 3 mm.

4. The relaxation method as claimed in claim 1, wherein said release film is baked while relaxing during relaxation.

5. The relaxation method as claimed in claim 1, wherein the relaxation method is implemented by a relaxation apparatus, wherein the relaxation apparatus comprises:

a relaxation chamber for supporting the release film; a first through hole penetrating in the vertical direction is formed in the relaxation chamber, and the space where the first through hole is located is an air storage chamber; a stripping film is arranged at the upper end of the first through hole;

the air supply chamber is used for providing compressed air and providing a negative pressure environment for the air storage chamber and is positioned below the relaxation chamber; the air supply chamber comprises an air supply pipe, a reducer pipe, an air outlet pipe and a compressed air source, and compressed air flows in the directions of the compressed air source, the air supply pipe, the reducer pipe and the air outlet pipe; the diameter-variable pipe is a diameter-variable pipeline with the diameter from large to small according to the flowing direction of compressed air, and a second pore channel corresponding to the through hole of the air storage chamber is arranged on the pipe wall on the upper side of the diameter-variable pipe; when compressed air flows through the first through hole, a negative pressure environment is provided for the air storage chamber, and the stripping film extends downwards in the vertical direction.

6. The relaxation method as claimed in claim 5, wherein the air supply tube is connected at one end to a source of compressed air and at the other end to the end of the reducer tube having the larger diameter, the compressed air being supplied from the air supply tube to the reducer tube; one end of the air outlet pipe is positioned at the compressed air outflow side of the second pore passage in the reducing pipe, the other end of the air outlet pipe is positioned outside the reducing pipe, and the axle centers of the air outlet pipe and the reducing pipe are positioned on the same horizontal position.

7. The relaxation method as claimed in claim 5 or 6, wherein the end of the outlet pipe located in the reducer pipe is connected with the thread arranged on the inner wall of the reducer pipe through the outer wall of the outlet pipe, and the distance between the outlet pipe and the gas supply pipe can be adjusted through the thread.

8. The relaxation process as claimed in claim 5, wherein the pressure of the compressed air in the air supply tube is 1.2 to 1.8 times the standard atmospheric pressure.

9. The relaxation process as claimed in claim 5, wherein the flow rate of compressed air in the air supply tube is 0.5 to 2L/min.

10. The relaxation method as claimed in claim 5, wherein the number of the gas supply chambers is 1 or more; the relaxation device further comprises a main air supply unit which supplies compressed air to all the air supply chambers.

11. The relaxation method as claimed in claim 5, wherein a soft pad for supporting the peeling film is placed on a diametrically upper end of said first through hole.

12. The relaxation method as claimed in claim 5, wherein the relaxation device further comprises a drying device.

13. The relaxation method as claimed in claim 5, wherein said peeling film is fixed to a backing plate and placed on the upper end of the first through hole, wherein the size of the first through hole is smaller than the size of the backing plate and larger than the size of the peeling film.